this is what worked for me, though I didn't take this stack for more than 6 days. I made it with 1/4 tablet of caffeaspirine, 1/4 tablet of afrinex, and 1tsp of coffee... and took it twice per day, one after my second meal (more or less 10:am) and the other after my fourth meal (around 2pm)... that together with a good cutting diet that also prevented from feeling week... it may be other ways of doing the ECA stack, but thats what worked for me.